CVE-2025-9826
📋 TL;DR
A stored cross-site scripting vulnerability in M-Files Hubshare allows authenticated attackers to inject malicious scripts that execute in other users' browsers. This affects all users of M-Files Hubshare versions before 25.8 who have authenticated access to the system.
💻 Affected Systems
- M-Files Hubshare
📦 What is this software?
Hubshare by M Files
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as other users, redirect to malicious sites, or install malware on user systems.
Likely Case
Session hijacking, credential theft, or unauthorized actions performed in the context of other users.
If Mitigated
Limited impact due to same-origin policy restrictions, but still potential for data theft within the application.
🎯 Exploit Status
Requires authenticated user access; exploitation involves injecting scripts into stored content that other users view.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 25.8 and later
Vendor Advisory: https://product.m-files.com/security-advisories/cve-2025-9826/
Restart Required: No
Instructions:
1. Download M-Files Hubshare version 25.8 or later from official vendor sources. 2. Follow vendor upgrade documentation for your deployment type. 3. Verify successful upgrade and test functionality.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation and output encoding for user-controllable data
Content Security Policy
allImplement strict Content Security Policy headers to restrict script execution
🧯 If You Can't Patch
- Restrict user permissions to minimize who can create/modify content
- Implement web application firewall rules to detect and block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check M-Files Hubshare version in administration console or via version API endpointCheck Version:
Check administration interface or consult vendor documentation for version query methodsVerify Fix Applied:
Confirm version is 25.8 or higher and test XSS payloads are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual content creation/modification patterns
- Suspicious script-like strings in user input logs
Network Indicators:
- Unexpected script tags or JavaScript in HTTP requests
SIEM Query:
source="mfiles-hubshare" AND (message="*<script>*" OR message="*javascript:*" OR message="*onload=*" OR message="*onerror=*")